Frame for reinforced concrete structures.



A. H. JASHJIAN. FRAME FOR REINFORCED OONGRETE STRUCTURES.

APPLIOATION FILED MAR. 17, 1911.

1,013,698. Patented Jan.2,1912.

147T ORNEYS UNITED STATES PATENT OFFICE.

ARMEN H. TASHJIAN, Ol PORTLAND, MAINE.

FRAME FOR REINFORCED CONCRETE STRUCTURES.

Specification of Letters Patent.

Patented Jan. 2,1912.

Application filed March 17, 1911. Serial No. 615,167.

tures, and it consists in the combinations, constructions and arrangements here1n de-- scribed and claimed.

In most frames whlch are used as a reinforcement upon which the concrete is laid for structures of the reinforced concretetype, there are two sets of members, first, the main bars which take the direct tensile or compressive stresses, and second, the secondary bars which take the shearing or diagonal stresses. In making an ideal reinforcing frame there' are certain points that should be kept well in mind. The main bars must be of such ashape as to'present a maximum contact area to the concrete. These main bars should also be of such form as to allow a rigid and easy attachment of the secondary bars, so that the whole frame may act as a rigid unit with no possibility of displacement during the pouring ofthe concrete. Besides this the members of the frame should be so constructed as to allow the fabrication of the units in the shop or field with the least amount of labor.

An object of my invention is to provide a frame which is composed of parts so constructed as to present a maximum contact area to the concrete.

A further object of my invention is to provide frame members which can be readily fabricated into a rigid frame.

A' -further object ofmy invention is to provide frame members which, by slight alteration, z'. 6., in the form of secondary bars,

may be fabricated into frames of variable My invention is illustrated inthe accompanying drawings in which- Figure 1 is a side elevation of a portion of a frame constructed according to my invention, Fig. 2 is a view of a modified form of the device, Fig. 3 is a section through one of the main bars showing the manner in which the frame is formed, Fig. 4 is a section similar to that shown in Fig. 3 showingthe main bars clamped to the secondary bars, Fig. 5 is a detailed section showing the manner of joining the main to the secondary bars, and Fig. 6 is a view similar to Fig. 5 showing a modified construction.

Referring now to the drawings, I have -shown therein the main bars 1 and 2 of which the frame is composed. The shape of these bars is best shown in Fig. 3. It w1ll be seen that they consist of a body portion a, of a substantially circular cross section havard size metal bar-of the same size as the standard groove in my main bars-on the two opposite faces of which are rolled a series of lugs Z whose surfaces are curved so as to conform with the cup-shaped recesses e in the main bar. The lugs however are smaller than these recesses e, as clearly shown in Fig. 6.

From the foregoing description of the 'various parts of the device, the operation thereof may be readily. understood.

In forming the frame the secondary bars are out in the necessary lengths according to the depth and shape of the frame, the ends X bent so as to allow two or more lugs on each bent end. These bent portions are. placed in the grooves d of the main bars. The position of the secondary bars at this stage of fabrication is shown in Fig. 3. The flanges band a are now forced together so as to clamp the'secondary bars in the manner shown in Fig. 4. The structure thus formed is absolutely rigid because the ends of the bars are held in two places.

In some instances it is desirable to have a frame which may be made of a variable depth, and in this case I prefer to cut away my secondary bars, so that one lug at each and comes close to the end, as shown in Figs.

2 and 6, so that only one lug at each end registers with the recesses e m the lips of the flanges b and 0. The ends of the secondary bars are bent to a slight curve, so that when the frame is collapsed in the direction of the arrows shown in Fig. 2, the lugs of the secondary bars will not be in the way. The lugs Z of the secondary bars between the main bars and outer bulged surfaces of the main bar cups serve as surfaces of attachment for the concrete thus havingthe effect of a corrugated surface.

I claim 1. In a reinforcing frame for concrete structures, a pair of main bars each being provided with a pair of outwardly extending flanges, each of said flanges having a series of recesses at equal distances apart, a series of transverse or secondary bars each transverse bar being provided with a series of lugs spaced apart at equal distances, the end lugs of said transverse bars being adapted to enter the recesses in said flanges, the

said transverse bars being arranged to be clamped between said flanges.

2. In a reinforcing frame for concrete structures, a pair of main bars, each of said main bars being provided with a pair of outwardly'extendlng flanges on one side there.- of, each of said flanges having a series of recesses stamped therein at equal distances apart, a series of transverse or secondary bars, each transverse bar being provided with a series of lugs spaced apart at equal distances, the end lugs of said transverse bars being adapted to enter the recesses in said flanges, and the intervening lugs serving as surfaces of attachment for the concrete, said transverse bars being arranged to 8e clamped between the flanges of said mainars.

ABMEN H. TASHJIAN. Witnesses HENRY WINGATE SriavENs, CHAs. E. B. KING. 

